I have the same question. There is no "avatar" upon whose "picture area" I can click on my Account Details page. All there is, is a tiny yellow square with a white "P" in it on the menu bar at the top of the page next to my username. I've tried turning off all my browser security add-ons, and have tried multiple browsers, both mobile and desktop. I've also tried under "Your Profile" where there is a large image of my current default avatar, to no avail.
Help?
I know it's probably something really stupid I'm doing in my current sleep-deprived state, and it's aggravating.